dV/dt Filter
PWM-drive output filter intended to limit voltage rise rate and peak voltage at the motor terminals.
A dV/dt filter is installed at the output of a variable-frequency drive or another PWM drive ahead of the motor cable.
Its main purpose is to reduce voltage-edge steepness, thereby decreasing electrical stress on motor insulation and limiting reflected-wave effects that become particularly important with long motor cables.
The key characteristic is the maximum permitted or achieved output dV/dt on the filtered side.
Additional selection parameters include inductance, percentage impedance, voltage drop, power losses, rated current, and permissible PWM switching frequency.
A dV/dt filter does not reconstruct a fully sinusoidal output voltage and serves a different purpose from a sine-wave filter.
dV/dt filters for VFDs, servo drives, and other PWM motor drives.
dV/dt Filter
General3
Commercial or technical designation of a manufacturer's product family sharing a common design and compatible characteristics.
Range of tasks and systems for which the manufacturer recommends the component.
Primary function of the device and its intended use as defined by its design and the manufacturer's documentation.
Dimensions6
External horizontal dimension of the product between its outermost lateral points.
External vertical dimension of the product from its lowest to its highest point.
External distance between the foremost and rearmost surfaces of the product.
External linear dimension of the product along its longitudinal direction or principal length axis.
Transverse dimension of a product or its circular element measured through the centre between opposite points of the circumference.
Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.
Mounting and Installation8
Method used to mechanically secure the product to a support, surface, or load-bearing structure.
Installation arrangement permitted by the product design, such as wall-mounted, flush-mounted, floor-mounted, or another specified mounting type.
Permissible spatial orientation of the component during installation and operation.
Indicates whether the design provides for mounting equipment on a DIN rail.
Number of holes provided in the product for mechanical fixing.
Diameter of the hole provided for a fixing element used when mounting the product.
Distance between the centres of mounting holes in the horizontal direction.
Distance between the centres of mounting holes in the vertical direction.
Electrical Parameters12
Voltage value assigned to the product by the manufacturer for specified application conditions and characteristics.
Nominal inductance of a reactor, choke, filter or winding.
Maximum voltage slew rate at the filtered output under declared conditions.
Current assigned to the product by the manufacturer for the declared operating and thermal conditions.
Manufacturer-declared attenuation of common-mode electrical interference under specified test conditions.
Rated impedance expressed as a percentage at the specified current and frequency.
Manufacturer-declared attenuation of differential-mode electrical interference under specified test conditions.
Rated active electrical power of the product declared by the manufacturer for specified operating conditions.
Voltage drop across the component at the stated operating point, expressed as a percentage.
AC frequency assigned to the product for normal operating conditions.
Manufacturer-declared power dissipation/loss at the stated load condition.
Electrical power consumed by the product itself in the declared normal operating mode.
Environmental Conditions10
Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP code.
Class of enclosure resistance to external mechanical impacts designated by the IK code.
Minimum ambient temperature at which normal operation of the product is permitted.
Maximum ambient temperature at which normal operation of the product is permitted.
Minimum ambient temperature permitted during storage of the product while not in operation.
Maximum ambient temperature permitted during storage of the product while not in operation.
Minimum relative air humidity permitted for the declared operating or test condition.
Maximum relative air humidity permitted for the declared operating or test condition.
Indicates whether the product's resistance to vibration has been verified under the declared conditions.
Indicates whether the product's resistance to short-duration mechanical shocks has been verified.
Standards and Compliance7
Indicates whether the CE marking is applied to the product where applicable.
Indicates whether product compliance with applicable RoHS restrictions on hazardous substances has been declared.
Indicates whether the manufacturer declares product compliance with IEC 60529.
Indicates whether the product has been tested according to applicable methods of the IEC 60068 series.
Compliance with applicable IEC 61800-3 EMC requirements for adjustable-speed electrical power drive systems.
Compliance with applicable IEC 61000-6-2 generic immunity requirements for industrial environments.
Compliance with applicable IEC 61000-6-4 generic emission requirements for industrial environments.